Motor/blower unit for portable sprayer device and the like



H. EMMERICH Jan. 12, 1965 MOTOR/BLOWER UNIT FOR PORTABLE SPRAYER DEVICE AND THE LIKE Filed June 24, 1963 HEINZ EMMERICH to be carried upon the back United States Patent 3,165,256 MOTOR/BLQWER UNIT FOR PORTABLE SPRAYER DEVICE AND THE LHKE I Heinz Emmerich, tuttgart-Feuerhach, Germany, assigno to SOLO Kleinmotoren G.rn.h.l., Maichingen, Wurtternherg, Germany, a corporation Filed June 24, 1963, Ser. No. 2%,116 Claims priority, applicgtigg Germany, June 26, 1962,

2 Claims. 61. 230-116) j The present inventiontrelates to improvements in portable spray devices and, more particularly, to motor/ blower units for devices of the type which are designed spraying of fluids. s While it has been proposed heretofore to provide a sprayer device'transportable on the back of an individual i for dispensing insecticides and other crop-treiating agents and, in'general, for the distribution of gases, liquids, pow- H ders and aerosols at locations remote from stationary sources of power andmobile' unitsof large size, such devices, when provided witha prime mover, did not find widespreaduse as a;consequence ofsevenal structural disadvantages. In general, they were provided with lightweight, internal-combustion engines and pumps or com- .press ors coupled therewith, both elements of the devices being mounted upon a carrying frame or packboard adapted to'be strapped to the back of the user. Since the relatively small engines thus provided requiredignition 7 means for their operation, the magneto, high-tension coil, condenser and breaker points were commonly provided on a support plate .at the rearmost part of the engine, especially since the breaker points had to be disposed at an accessiblelocation to permit adjustment and drying when necessary. In conventional devices; the blower means were disposed proximal to the support frame while the 'motor or"engine,'-with its cylinderfwa spaced axially rearwardly therefrom, the magneto and other parts of the ignitionlmeans beingprovided at the rearmost part of the I shaft. Since the magneto comprises, as is customary,a'

field magnet, forming a stationary element together with its yoke or core, while other magnetic means (eg. 'a permanent magnet forming the movableelement) was provided on the shaft, the considerable weight of the ignition system, was concentrated-at the maximum-distance from the support frame and thus was effective with a large torque moment in tending to pull the frame rearwardly from the shoulders of the user. Not only was this arrangement highly uncomfortable, but spraying eiliciencies were reduced manifold as aconsequence of the inability of the person using the apparatus to maintain it on his b ack for prolonged periods. Furthermore, when the magneto had one o'faits magnetic elements mounted directly upon the shaft, the low relativespeed of, the magnetic elements was frequently incapable of generating the high potential required for energizing the spark plug."

It is an object of the present invention to provide an engine/blower arrangement, particularly adapted for use with porttble spnaying devices, wherein the aforementioned disadvantages are avoided.

Another object of my invention is to provide, in a systern of this type, means for eliminating the inconvenience of a large moment of force as a consequence of the location of at least the massive portions of theignition means at a position remote from the carrying frame or support. i

Yet anothenobjectof this invention is to provide a motor/blower arrangement having aniniproved ignition system. i

parent hereinafter, are attained in accordance with the of a person for prolonged 3,lh5,25h Patented Jan. 12, 1965 resent invention by providing an internal-combustion engine having an outputshaft and fluid-displacing means mounted upon this shaft with an ignition system wherein the magneto elements are mounted upon the rotor associ ated with the fluid-displacing means. Thus it is possible to eliminate the considerable moment of force deriving from the weight of the magneto elements by disposing them close to or within the blower which is generally provided proximal to the black of the individual carrying the device. Advantageous'ly, the fluid-displacement means comprises an impeller-type rotor, forming a flywheel for the motor, received in the blower housing, at least part of the magneto means of the. ignition system being mounted in this housing. I

, According to another feature of this invention, the costs and weight involved in disposing the magneto in the blower the retention of the breaker points upon-the motor shaft at a location remote from the blower, since these breaker points generally'have an insignificant weight, even when their cam is considered, and are thus disposed in a highly accessible location for service. The connection between the field coiland the breaker points'in an engine system of the type described is usually a low-tension conductor so that, losses are avoided.- The high-tension winding of the magneto can be connected directly tothe spark plug or plugs of the engine. Itfshould be noted that it is preferred'to use a two-cycle engine for this purpose, the

fuel being admixed with lubricating oil prior to introduction into the engine. The motor/blower assembly can be mounted upon a carrying device of the type described in the commonly assigned copending application Ser. No.

289,859 filed concurrently herewith by Heinz SClll'lllfiIt-Il."

V Theabove and other objects, features and advantages of the present invention will become more readilyapparent from the following description,-referencebeing made to the'appended drawing in which; Y

, FlGi l -is a rear-elevational view incorporatingjra,motor/blower{arrangement according to the present invention; f

- FIG. .2 ,isfa side-elevational view, partlyin axial crosssection, showing the motor/blower unit in greater detail;

and

FIG. 3 is a diagram showing an ignition system suitable for use with thisunit. I 3

In FIGS; 1 and 2 there is shown a portable spray device adapted to be mounted upon the back of the user and Y comprising a support frame ill, of the type described in carrying plate 14.

the aforementioned copending' application, integrally formed with a receptacle 11 for the liquid to be dispensed and, advantageously, a tank 12 for supplying fuel to the engine 3 via a suitable fuel line not shown. The frame can includeva pair of lateral supports 13' between which a plate 14 is provided, suitable webs '15 reinforcing the junction between the receptacle 11, the tank 12 and the fort, the" carrying frame should be provided with a curvature about a generally 'vertical axis so as to fit snugly The above and other objects, which will becorne apagainst the back of the user and, advantageously, a

curvature about a horizontal :axis so that the tanks rest against the shoulder region of the wearer. Suitable straps,

of a spray device.

It will be apparent that, for comsecure the carrying frame to the shoulder of the user.

The motor/blower unit, as .previously'rnentioned, comprises an internal-combustion engine 3, which is here shown to be of the'onercylinder, two cycle type, rnounted 'ia flanges 3"on the rear plate 1' vof a blower housingl to pedestals integrally formed on the carrying frame it) 1 via the usual bolts and, if desired,.resilient feet. The;

lower housing 1 is so mounted that its axial intake opening in 'is spaced from the carrying plate 14 to permit induction-of airf into the interior of the blower whence this not'further described but known per se, are provided to which, in turn, oan be formed with lugs 1 for connection r air can ib e displaced by an'impeller 2 mounted upon the 7 output shaft "3",of engine 3. This impeller .sha ft functions' as a flywheel for the engine andmay have an annularportion 2' whichcan be aring integral with but rearwardly of the impeller. disk 27? carrying the radial vanes or blades 2a, Y

The ignition system'of this engine comprises, according to the inventiomthe usual spark plug iirz and a magneto field coil 6; which ismounted upon, the blower housing' If and at least partly received therein. The pole piece 7 of this field coil extends radially in closely spaced relationship with the impeller .2, which is provided with a permanent i magnet 4 (FIGSQZ and 3) adapted to generate the igniv tion pulse, the field coil'd being connected-to-the' spark plug 34; of engine cylinder 9 by means of the ignition 7 cable 8. Since this magnetoarnangement 4,6,. 7 ceml, prises a moving elementrelativ'ely remote frornthe" axis" of rotation ofithe shaft 3", .the preipheral. speedlofi the permanent'rnagnet t'may be such that additional voltage: 7 increasing meanscan be dispensedwith. ever, the motor shaft 3" can be provided; at its extremityl remote from the blower, with the usual breaksirpoints in anfaccessible and removable housing-16. To counterbalance'the perrnanent magnet-'4, ringl' also is provided "with a" counterweight 5 diametrically oppositethis magnet 4. i

" Y The tangential outlet 17 of the blower housing loan thetube carrying'fluid frointhe receptacle 11 provided upon frame ii) to the conventional spray head. It -will be provided with suitable conduit means IScohnected with capacitor 22; which can be mounted either in the blower casing .1 together with themagneto yoke 7 or-within'casing 7 16; is connected between this low-tension winding and ground. Another cable 23 is then provided-to connect this low-tension winding 6" totthe breaker. points in casing 16. g i a v V v The invention described and illustrated is believed to admitof many modificationswithin the ability of persons a skilled in the art, all such modificationsbeing considered within the'spirit and'scope of the eppendedclairns,

Iclaim:l i a 1. In a portable spraying apparatus, incombination,

'housingmeansadapted to be carriedupon the backof an operator and provided with a compartment'having a major dimension generally parallel'to thefback of said operator, said housing means being'provided with an inlet open to the atmosphere for induction of air; outlet nieansonsaid If desired, how- I a V apparent that" this arrangement brings the Weight ofithe m g a, 6, 7 proximal to the a ii f th yusfir'and,

markedly" reduces the-moment "of force caused by its 'weight.fSince thebreaker points and the condenseiyoif 7 any is required, are of relativelyflittle weight, they can be accessibleibyr'emoval ofa cap on the rear housing 16 a of the engine.

1 ,ln PKG/3'1 show ithe breaker points 19,,it jcontained within housing 16 and controlled by'a cam'llimounted 1 lluponshaft 3; in thejusual, mariner. Infthisjcase, the, f field 6011s canbeconstitutedibya high-tensionwinding 6' connected to the spark plugfia and a low-tension-wind- 'ing 6" connected with the-breaker*pointsi 9,12tl. 'Af t UNITED sTArEs-rATs fr housingmeans for connecting said'co'mpartment to a spraying device; a blower impeller" journaledginL said 7 7 housing means anddisposed'within said compartment for rotation about an axis perpendicular to said rnajordimension, said blower impeller including a disk lyiilg generaliy in apiane parallel to the back ofsaid operator and formed with blade means along an axial sideoflsaid disk proximal to said operator; an internalicornbustion, engine mounted on said housing means 'rearwardly of said compartment and provided-with a shaft coupled with said impeller; and ignition meansffor operatingl'said engine, said ignition ;means' including .amagneto; magnet (mounted on saiddisk atla side thereof axiallyopposite'the first-mentioned side and remote from-said openato'r; fiel d' of relatively large. diameter, carrying-said bl ade means;

iurther comprisingcounterweightmeanson the first-mentioned step diametrically opposite. said" magneto 'niagnet' for balancing same. a

References' fiited the- Enaminen 2,157, 66 "5139",", Jacobi I I mag z sx fLAURENCE v. EFNER,firming Ex m v nosnn'rM; WALKER,Examiner.-' 7 

1. IN A PORTABLE SPRAYING APPARATUS, IN COMBINATION, HOUSING MEANS ADAPTED TO BE CARRIED UPON THE BACK OF AN OPERATOR AND PROVIDED WITH A COMPARTMENT HAVING A MAJOR DIMENSION GENERALLY PARALLEL TO THE BACK OF SAID OPERATOR, SAID HOUSING MEANS BEING PROVIDED WITH AN INLET OPEN TO THE ATMOSPHERE FOR INDUCTION OF AIR; OUTLET MEANS ON SAID HOUSING MEANS FOR CONNECTING SAID COMPARTMENT TO A SPRAYING DEVICE; A BLOWER IMPELLER JOURNALED IN SAID HOUSING MEANS AND DISPOSED WITHIN SAID COMPARTMENT FOR ROTATION ABOUT AN AXIS PERPENDICULAR TO SAID MAJOR DIMENSION, SAID BLOWER IMPELLER INCLUDING A DISK LYING GENERALLY IN A PLANE PARALLEL TO THE BACK OF SAID OPERATOR AND FORMED WITH BLADE MEANS ALONG AN AXIAL SIDE OF SAID DISK PROXIMAL TO SAID OPERATOR; AN INTERNAL-COMBUSTION ENGINE MOUNTED ON SAID HOUSING MEANS REARWARDLY OF SAID COMPARTMENT AND PROVIDED WITH A SHAFT COUPLED WITH 